Where does “sclera” come from?

sclera (New Latin) comes from Ancient Greek σκληρός, from Ancient Greek κορμός, from Ancient Greek κείρω, from Proto-Indo-European (s)kér-ye-, from Proto-Indo-European (s)ker-, from Proto-Indo-European sek- — to cut, cut off, sever.

Ancestry of “sclera”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	σκληρός	hard; harsh
2	Ancient Greek	κορμός	trunk of a tree; log of timber
3	Ancient Greek	κείρω	I shear, shave, cut hair short; I ravage, waste;...
4	Proto-Indo-European	(s)kér-ye-	—
5	Proto-Indo-European	(s)ker-	to cut off; to turn, bend
6	Proto-Indo-European	sek-	to cut, cut off, sever

Words derived from “sclera”

Every word from Proto-Indo-European sek- →Every word from Proto-Indo-European (s)ker- →Every word from Proto-Indo-European (s)kér-ye- →